A Modified Equation for Thickness of the Film Fabricated by Spin Coating

Lee, Un Gi; Kim, Woo‐Byoung; Han, Do Hyung; Chung, Hyun Soo

doi:10.3390/sym11091183

Cited by 31 publications

(19 citation statements)

References 17 publications

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“…The inversely proportional dependence of the layer thickness on the rotation speed was described back in 1958 by Emsley, Bonner, and Peck [ 30 ], considering the problem of the motion of a viscous non-volatile fluid on an infinite rotating disk. However, for the thicknesses of polymer films obtained from film-forming solutions by spin coating, similar dependence was also observed [ 31 , 32 ].…”

Section: Resultssupporting

confidence: 60%

Influence of Spin Coating Parameters on Gas Transport Properties of Thin-Film Composite Membranes

et al. 2021

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The influence of casting centrifugation process parameters, such as a rotation speed (ω), the amount of the film-forming solution (V), and its concentration (C) on transport properties of composite membranes were investigated. A number of composite membranes based on poly (1-trimethylsilylpropyne) (PTMSP) and micro- (MFFK-1) and ultrafiltration (UFFK) membranes were obtained using the spin-coating method. For the first time, an unexpected dependence of permeance and ideal selectivity on rotation speed had been discovered: the thickness of the selective layer decreases from 3.0 to 1.0 μm for MFFK-1 and from 1.7 to 1.1 μm for UFFK with an increase of spin coater rotation speed from 500 to 3000 rpm. However, the gas permeance of composite membranes in the range of 500–2000 rpm was reduced due to an increase of a penetration depth of PTMSP into a support layer porous structure (estimated by the EDX method). The permeance of the PTMSP/UFFK membranes was higher than PTMSP/MFFK-1 membranes due to a thinner selective layer and a lower penetration depth of polymer solution into the pores of the support. The highest CO2/N2 selectivity values were achieved as 5.65 ± 0.9 at CO2 permeance 5600 ± 1000 GPU for PTMSP/UFFK membranes (CPTMSP = 0.35%, Vsolution = 1 mL, ω = 1000 rpm), and 6.1 ± 0.5 at CO2 permeance 4090 ± 500 GPU for PTMSP/MFFK-1 membranes (CPTMSP = 0.35%, Vsolution = 1 mL, ω = 2000 rpm).

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Section: Resultssupporting

confidence: 60%

Influence of Spin Coating Parameters on Gas Transport Properties of Thin-Film Composite Membranes

et al. 2021

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“…The presented dilution of 1:9 (PDMS:hexane) does not rely on any pressure to be applied to seal off the uneven CMOS surface. Instead reliable stamp transfer is achieved by (1) creating a very thin homogeneous layer of PDMS on the wafer (Con and Cui, 2013 ; Lee et al, 2019 ) and (2) by avoiding any horizontal movement of the PDMS microstructure on the wafer and CMOS surface during the transfer. Diluting PDMS in a solvent enables spincoating of a very thin layer of PDMS at feasible rotation speeds.…”

Section: Discussionmentioning

confidence: 99%

Engineered Biological Neural Networks on High Density CMOS Microelectrode Arrays

et al. 2022

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In bottom-up neuroscience, questions on neural information processing are addressed by engineering small but reproducible biological neural networks of defined network topology in vitro. The network topology can be controlled by culturing neurons within polydimethylsiloxane (PDMS) microstructures that are combined with microelectrode arrays (MEAs) for electric access to the network. However, currently used glass MEAs are limited to 256 electrodes and pose a limitation to the spatial resolution as well as the design of more complex microstructures. The use of high density complementary metal-oxide-semiconductor (CMOS) MEAs greatly increases the spatial resolution, enabling sub-cellular readout and stimulation of neurons in defined neural networks. Unfortunately, the non-planar surface of CMOS MEAs complicates the attachment of PDMS microstructures. To overcome the problem of axons escaping the microstructures through the ridges of the CMOS MEA, we stamp-transferred a thin film of hexane-diluted PDMS onto the array such that the PDMS filled the ridges at the contact surface of the microstructures without clogging the axon guidance channels. This method resulted in 23 % of structurally fully connected but sealed networks on the CMOS MEA of which about 45 % showed spiking activity in all channels. Moreover, we provide an impedance-based method to visualize the exact location of the microstructures on the MEA and show that our method can confine axonal growth within the PDMS microstructures. Finally, the high spatial resolution of the CMOS MEA enabled us to show that action potentials follow the unidirectional topology of our circular multi-node microstructure.

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“…Spin coating is one of the most used methods in academic studies, as well as in industry, due to its capability for mass production at cheaper costs [ 95 , 96 , 97 , 98 ]. It is also easier to perform as it only requires a few drops of solution.…”

Section: Spin Coating Methodsmentioning

confidence: 99%

Review of the Common Deposition Methods of Thin-Film Pentacene, Its Derivatives, and Their Performance

et al. 2022

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Pentacene is a well-known conjugated organic molecule with high mobility and a sensitive photo response. It is widely used in electronic devices, such as in organic thin-film transistors (OTFTs), organic light-emitting diodes (OLEDs), photodetectors, and smart sensors. With the development of flexible and wearable electronics, the deposition of good-quality pentacene films in large-scale organic electronics at the industrial level has drawn more research attention. Several methods are used to deposit pentacene thin films. The thermal evaporation technique is the most frequently used method for depositing thin films, as it has low contamination rates and a well-controlled deposition rate. Solution-processable methods such as spin coating, dip coating, and inkjet printing have also been widely studied because they enable large-scale deposition and low-cost fabrication of devices. This review summarizes the deposition principles and control parameters of each deposition method for pentacene and its derivatives. Each method is discussed in terms of experimentation and theory. Based on film quality and device performance, the review also provides a comparison of each method to provide recommendations for specific device applications.

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A Modified Equation for Thickness of the Film Fabricated by Spin Coating

Cited by 31 publications

References 17 publications

Influence of Spin Coating Parameters on Gas Transport Properties of Thin-Film Composite Membranes

Influence of Spin Coating Parameters on Gas Transport Properties of Thin-Film Composite Membranes

Engineered Biological Neural Networks on High Density CMOS Microelectrode Arrays

Review of the Common Deposition Methods of Thin-Film Pentacene, Its Derivatives, and Their Performance

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